remove printing to stderr.

That was an attempt to get the full stdout/stderr output to be produced
by pytest for a test marked xfail.

Author: rouilj

test/test_templating.py

@@ -717,8 +717,8 @@ def test_string_markdown_code_block_attribute(self):
             test_output = m.replace('\n\n', '\n')
             expected_result = '<p>embedded code block &lt;pre&gt;</p>\n<div class="codehilite"><pre><span></span><code><span class="n">line</span> <span class="mi">1</span>\n<span class="n">line</span> <span class="mi">2</span>\n</code></pre></div>\n<p>new &lt;/pre&gt; paragraph</p>g'
             if  test_output != expected_result:
-                print("test_output:", test_output, file=sys.stderr)
-                print("expected_result:", expected_result, file=sys.stderr)
+                print("test_output:", test_output)
+                print("expected_result:", expected_result)
             self.assertEqual( test_output, expected_result)
 
     def test_markdown_return_text_on_exception(self):